ok i have find one way to this!
open cmd and write: for %f in (*.txt) do type “%f” >> combined.txt

this command join all txt content into new one txt. and this it’s ok.
now i want purge all content.
on my new combined.txt i want delete all content except a line that contains:
data: xxxx@xx.xxx:kkkkkkk
this value data:xxx… repeats itself and it’s always different.
how to purge combined.txt ??

So, apparently, you want to keep all lines beginning with an e-mail address, don’t you ?

In that case, here is a regex S/R to delete any line, which does not begin with an e-mail address, with possible leading blank chars :

SEARCH (?-s)^(?!\h*\w+@).+\R

REPLACE Leave Empty

Notes :

The part (?!\h*\w+@) is a negative look-ahead structure that search for the literal@ char, preceded by word chars and possible blank chars ( Space or tabulation chars ) This structure returns true and valids the overall regex only when an e-mail address cannot be found

In that case, the part .+ grabs, from beginning of lines ( ^ ), all standard characters, of the current line scanned

Finally, the part \R matches all types of line-breaks ( \r\n for Windows files, \n for Unix files and \r for Mac files )

These entire lines are deleted, as the replace*ent zone is empty

Now, here is the method to select specific e-mail addresses, from the remaining lines and copy them in a new document.

Let’s suppose that you want to search for all the occurrences of the exact address ccc@cc.cns:mssgahsk :

Open the Mark dialog ( Search > Mark... menu item )

First, tick the option Bookmark line, if necessary

Click on the Clear All marks button ( IMPORTANT )

Un-tick the Purge for each search option, if necessary

Select the Normal search mode ( IMPORTANT )

Tick the Match case option, preferably

Tick the Wrap around option

SEARCH ccc@cc.cns:mssgahsk

Click on the Mark All button

You may change the Find what : contents and repeat the last2 points, in order to bookmark other specific addresses, as well !

Hmm. This forum doesn’t exist for someone else to do your work for you. Some hints about how a feature of Notepad++ works, yes, but really, don’t expect to say “I need this very specific thing” and expect someone to hand it to you.

You’re expected to try things on your own, and present your (failed) results here and then you’ll probably receive help on just that aspect.

thank you very much. excellent result. I’d still like if you could also delete the first part of the text in front of the email from:
asda address@mail.com: mrthhrhmm17
until you get:address@mail.com: mrthhrhmm17
this of course for all the email addresses listed …

No problem ! If we assume that there are no space char in e-mail addressses ( generally the case ! ) and further on, in current scanned line, we just need to add an alternative which, implicitly, looks for lines with an e-mail address and deletes from beginning of current line till a non-null range of space characters. Thus, the following regex S/R :